<?php

namespace App\Actions\Git\Gitea;

use App\Actions\Git\Contracts\GitProviderClient;
use App\Actions\Git\Data\GitAuthenticatedUser;
use App\Actions\Git\Data\GitBranch;
use App\Actions\Git\Data\GitPullRequest;
use App\Actions\Git\Data\GitRepository;
use App\Actions\Git\GitProviderKey;
use Illuminate\Http\Client\PendingRequest;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Str;

class GiteaProviderClient implements GitProviderClient
{
    public function key(): GitProviderKey
    {
        return GitProviderKey::Gitea;
    }

    public function getAuthenticatedUser(string $baseUrl, string $token): GitAuthenticatedUser
    {
        /** @var array{id: int|string, login: string, full_name?: string|null} $payload */
        $payload = $this->request($baseUrl, $token)
            ->get('/user')
            ->throw()
            ->json();

        return new GitAuthenticatedUser(
            providerUserId: (string) $payload['id'],
            login: $payload['login'],
            name: blank($payload['full_name'] ?? null) ? null : $payload['full_name'],
        );
    }

    public function getRepository(
        string $baseUrl,
        string $token,
        string $owner,
        string $repository,
    ): GitRepository {
        /** @var array{
         *     default_branch?: string|null,
         *     id: int|string,
         *     name: string,
         *     full_name: string,
         *     html_url: string,
         *     owner: array{login: string},
         *     private: bool
         * } $payload
         */
        $payload = $this->request($baseUrl, $token)
            ->get('/repos/'.rawurlencode($owner).'/'.rawurlencode($repository))
            ->throw()
            ->json();

        return $this->mapRepository($payload);
    }

    /**
     * @return array<int, GitRepository>
     */
    public function listRepositories(string $baseUrl, string $token): array
    {
        $page = 1;
        $repositories = [];

        do {
            /** @var array<int, array{
             *     id: int|string,
             *     name: string,
             *     full_name: string,
             *     html_url: string,
             *     owner: array{login: string},
             *     private: bool
             * }> $payload
             */
            $payload = $this->request($baseUrl, $token)
                ->get('/user/repos', [
                    'limit' => 100,
                    'page' => $page,
                ])
                ->throw()
                ->json();

            foreach ($payload as $repository) {
                $repositories[] = $this->mapRepository($repository);
            }

            $page++;
        } while (count($payload) === 100);

        return $repositories;
    }

    /**
     * @return array<int, GitBranch>
     */
    public function listBranches(
        string $baseUrl,
        string $token,
        string $owner,
        string $repository,
    ): array {
        $page = 1;
        $branches = [];

        do {
            /** @var array<int, array{name: string}> $payload */
            $payload = $this->request($baseUrl, $token)
                ->get(
                    '/repos/'.rawurlencode($owner).'/'.rawurlencode($repository).'/branches',
                    [
                        'limit' => 100,
                        'page' => $page,
                    ],
                )
                ->throw()
                ->json();

            foreach ($payload as $branch) {
                $branches[] = new GitBranch(
                    name: $branch['name'],
                );
            }

            $page++;
        } while (count($payload) === 100);

        return $branches;
    }

    /**
     * @return array<int, GitPullRequest>
     */
    public function listPullRequests(
        string $baseUrl,
        string $token,
        string $owner,
        string $repository,
    ): array {
        $page = 1;
        $pullRequests = [];

        do {
            /** @var array<int, array{
             *     html_url: string,
             *     merged?: bool,
             *     number: int|string,
             *     state: string,
             *     title: string,
             *     head: array{ref: string}
             * }> $payload
             */
            $payload = $this->request($baseUrl, $token)
                ->get(
                    '/repos/'.rawurlencode($owner).'/'.rawurlencode($repository).'/pulls',
                    [
                        'limit' => 100,
                        'page' => $page,
                        'state' => 'all',
                    ],
                )
                ->throw()
                ->json();

            foreach ($payload as $pullRequest) {
                $status = ($pullRequest['merged'] ?? false) ? 'merged' : $pullRequest['state'];

                $pullRequests[] = new GitPullRequest(
                    number: (string) $pullRequest['number'],
                    title: $pullRequest['title'],
                    status: $status,
                    sourceBranch: $pullRequest['head']['ref'],
                    htmlUrl: $pullRequest['html_url'],
                );
            }

            $page++;
        } while (count($payload) === 100);

        return $pullRequests;
    }

    public function createBranch(
        string $baseUrl,
        string $token,
        string $owner,
        string $repository,
        string $newBranchName,
        ?string $oldRefName = null,
    ): GitBranch {
        $payload = [
            'new_branch_name' => $newBranchName,
        ];

        if ($oldRefName !== null && $oldRefName !== '') {
            $payload['old_ref_name'] = $oldRefName;
        }

        /** @var array{name: string} $response */
        $response = $this->request($baseUrl, $token)
            ->post(
                '/repos/'.rawurlencode($owner).'/'.rawurlencode($repository).'/branches',
                $payload,
            )
            ->throw()
            ->json();

        return new GitBranch(
            name: $response['name'],
        );
    }

    private function request(string $baseUrl, string $token): PendingRequest
    {
        return Http::acceptJson()
            ->baseUrl($this->apiBaseUrl($baseUrl))
            ->connectTimeout(5)
            ->timeout(10)
            ->withHeader('Authorization', 'token '.$token);
    }

    private function apiBaseUrl(string $baseUrl): string
    {
        $normalizedBaseUrl = Str::of(trim($baseUrl))
            ->rtrim('/')
            ->value();

        if (Str::endsWith(Str::lower($normalizedBaseUrl), '/api/v1')) {
            return $normalizedBaseUrl;
        }

        return Str::of($normalizedBaseUrl)
            ->append('/api/v1')
            ->value();
    }

    /**
     * @param  array{
     *     default_branch?: string|null,
     *     id: int|string,
     *     name: string,
     *     full_name: string,
     *     html_url: string,
     *     owner: array{login: string},
     *     private: bool
     * }  $repository
     */
    private function mapRepository(array $repository): GitRepository
    {
        return new GitRepository(
            providerRepositoryId: (string) $repository['id'],
            owner: $repository['owner']['login'],
            name: $repository['name'],
            fullName: $repository['full_name'],
            htmlUrl: $repository['html_url'],
            defaultBranch: blank($repository['default_branch'] ?? null)
                ? null
                : $repository['default_branch'],
            isPrivate: $repository['private'],
        );
    }
}